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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af8aac228f76cba0cfab8e81c536fc77173fd87f676358c602a54715568052' 
  AND token = 'K3Yx8Kl2cODY4wNLz3a995XSpiNPUGUz/gr4jY2eBpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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