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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3c35273cf88cffd78f4f496c72e7b8b68f86ddd2dcb5f76ac90090488aa8cf' 
  AND token = '5vPE6PS2QWTSVriUqzH0QiGSNb/50VmoRe0XUFpLRrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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