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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46cc81ecdf20712145e82e3c71461c086fc603d479acfa5c72a5479164dbf552' 
  AND token = 'dYvAr0YoUN6Ms9NfNkKBGFxC0xf+tQcHjhza7KtktHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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