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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc353ec85c788dc72fe02d1286851cf0c328be159ed4f5924b2089a54077a65' 
  AND token = 'ASy+sF8CB4iUYpjPmbHcVuoPcnRYuMc1vSLVa981IUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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