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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747ad2c9333f6c5dc087e8dbbf4245c100ac64ec614a1b1ad4803c8ab3a4a118' 
  AND token = 'LvVlFLagj9yj5a07Vb+7OuesUrM5eAeblB4Ukt4Z6W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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