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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a26b8fef9a73ed323653ed5f90bba1aabdea90db35b3cad92a9e2f168c05d91' 
  AND token = 'hVgdSZs9yjvjC6ZVe/e/Lmig9VtzfVRXQy2cB/wRudU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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