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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3835545cc1c862015ce15452f2863f44fc42628c5c3440bcecaf2bf8f618b4' 
  AND token = 'N1XxcW0O0PxeDUXGnTFiCpAFf3aeU9h8xX8CT7s8+LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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