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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33015162d7626ceed6c1a07f318a06c943e21bd8573b5467c56036363d41771e' 
  AND token = 'iooq9/wiPwkTjvh8FhmLBaVo62PgYkgyjDBm42q3DFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}