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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a26f6e1a72ea812967c0fff17fb570d5bb15423654b2c862b4e1a64836f97bf' 
  AND token = 'udfI2+qQC6k1aOHHf7/8JMvmp7742S/I23mopoFucJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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