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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e6a8fba3760c9211fdfddad7f93fe0af46f07195f7caadd88c06cdce6cada9' 
  AND token = 'IMg2aFVXQMo+evNLRL62zK9ETcHIzh2ZZo28ylk7gB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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