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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bff39c855e2bb4950130ea3ce8844f700a52ff15f2feddf8a27d305ad57f010' 
  AND token = '3GYZjp4rbDFU1dUQI5+rdNZqb/4lbJ6kTrUny6XC//o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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