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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb4622602da56cfe300eee16002356cf12cd7641f09d99c8af966632a63a6c9' 
  AND token = 'xumOnH2RSY9ngu8REWewb6Bovz860xzM+xbDwKu3SK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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