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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5593f9f8c22f3e81f91f5a9c1b2de9999df8f8979948e06f6f061188ad9a5703' 
  AND token = 'Lg02wYeyZ08VgJW7J7TjioA4inA1bUjCdz4Hgr6C49g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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