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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce0b1e5e4f7d466be584ff0fe470cab8421c4edae6ad8895fb0aae9ffd31251' 
  AND token = '2YoXiHLgsY4GDVAOHEIqOoQ2gxvYoGX3wCLPETl6D1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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