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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d4c0940dc3ddeb08dd02cd8cfdf380aea49e101239cd3b1ca08dfcf34c45aa' 
  AND token = 'xOBm06UC/Kls2vzt5jdEf2fmqH2Xv8YfIA81AL2AZAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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