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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0eb1872e63c2ac24c166f76942567046ea0748b7971b1b02650a92bfe4e7ce' 
  AND token = 'l5BxoBnEMROVjo/zTb0tT9ZTv3xpEjlF2IRGh+Mebdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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