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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55da82eb34c3e97a64c65466c9c7de88853c83232bbadaabedf3efa86da6287' 
  AND token = 'LUTcy87R6Ap1+e8ZvwU38OLj5aDMAjlo+Svz/iqJU5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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