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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8bc8a36a480d0c827f79175b07e18c8134199716d58f6a37970ff8bcea8acd' 
  AND token = 'N7K6fXI5peDc3D81S3mgngpcMWDpI3rvRNh/I8unKso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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