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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04580907c14a574f7e81817442289045cdae9b395ddc2c8425f7e050eed99836' 
  AND token = '3D4wCg1v2kJMY/Z8DLlrYDqUhBaprHP8EccxpjHoqk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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