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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19816dfb27f3b5f53a37d374767475176ebae2c36041897eef657640f1ad285e' 
  AND token = '/SRL8QIa6fcGEEvjtQ0hIwAiJXd0cqDwUkN9ou/affs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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