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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405ce8ce033b1ee2602e2f605e8991a2dc7b54c6b503d4eaeb63da2c6015ecf5' 
  AND token = 'NkfxS//RTkbJ1AxArLoUvE0VrU52mH+Art7+vcs+32M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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