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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5347e2325cd4fd7b622a7f0fc919075b9500d00792d56ebdd2c9436a14c7fe10' 
  AND token = 'aFBJTFTpyWtVGi6xYywe5Yih9pXoYb4hthHLpOwR9hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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