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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc08b986b12944031a622f3da909f6588e237ab1808a4e17eaa35daf38502128' 
  AND token = 'Y/WZe5oqPu7TdCGGufYBGIoXS3bjztgLV1Lta7WHHxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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