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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bb08cbebb5809773fac08e86abb47fcc97e192da5466e042b1fb7aa4328a17' 
  AND token = 'wooy/oxd1uIIgTNxVKHE/PWllwJaZFeQi1VzHkWtod8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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