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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bac3ec89e90464a31ea6a5abb88ca33befb5bd2477647f54a7a376df81effcd' 
  AND token = 'bXWk8cbvwDavuOhIX05LC2F1GvppegcMGXzn+5d9lq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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