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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c64ccbbecf572890ce04bfa060f872b7704528ecb3c7d5ef89b322923d008b6' 
  AND token = 'TWzm2TdT2CCimNmqGDQEhqKc4ccIM7YJWz1f4GsyVJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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