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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5cdd69b4b079e79e26b653891e8cb3e0607f5a45d5ff6e805a29aa94918a6b' 
  AND token = 'AIQSob2Yg2XmrMM1umz7Ud4Dq40YG0N8Utv80ym7q2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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