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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704d68f1753354e5d9daaeac0888a6d55f31892c9318e5b612f1bf3c71ce1ada' 
  AND token = 'z/DpUhBNr0yl9UfTzcyisyqdzhAYAoyBZrx98LYoENs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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