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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ff862a6be9f4eef857ab1d6743fcd76d895dd7ecf8660347fd13fdc9bf3a67' 
  AND token = '5sFcGvsuFk36WllmyKVI46lZYogHy8JbA5FgOnwmeoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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