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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd82d8e256e97bfc8ee947860246eaa63f6474db1fe007ae4e8b80b2ce1077d6' 
  AND token = 'KQoJN2Oc18IleOMsxe1T4DTaUsPCwgMQa25y8P6vGcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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