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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3b4f1803bd0ba3c567f8d46dfa9fa4978eb24dca6ed8e6c3bdb92f0a25fdb2' 
  AND token = 'WhmuF06GoNvx+MBglplelN3AvPmNNgney1Vwh9GUMtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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