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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2696a8c808fde31576d975cf6b2f760899f09a065c32497f72f00adef2ca7ad5' 
  AND token = 'uwDzzm6ku6KSNq8H/nnxjxYIyHmoMYyWOug3TNHo3M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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