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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7463ad87f70cdf9d05d12da786d00039fb7f8b368169683ec14f4bde4284d20' 
  AND token = 'CmRaS5K6TJ4y5p8Y1AgQc38brxvWb7X/o76pn+ULQ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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