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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd11262bca93fbca32c7555cb182542779ced90ee7c1b371be8c72adfc2469ba' 
  AND token = 'gwCEWovb1SeXecPZy4cli+4V5Wi9V3qIFbwLiouTtL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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