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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fe87f7e8e312b4c67e6caf7fa6689e7c0d9f1372cdcf8291ecd275cf16cdf2' 
  AND token = 'DVI1zlv9HnGr4tDxD1LDrXR6ZDmub7Vbke3KDAHWNxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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