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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d4587db14cd1f590601ea3d2761f9b7a61d498ab739fd0b20aba5035ce663b' 
  AND token = 'g/AlQ0H+nBY763ys4LI8CnNi6f8BIDbWph00mr1M+Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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