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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd835542dd3e813700f7b85d782d9b3e06715743a22704a118a5ac009d650d116' 
  AND token = 'mchPKLv6i5fHF/JZ8/lS0MT8/fStN8LwwD/LbEMhUac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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