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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608481e93e81c377425cd1a09b7d0fc9e0e35855769824ef1f1323882f8a1c9e' 
  AND token = '7nbeifTPgEvlBELBtj5WAQZsqfzv4nSGIPFsL+Gl8Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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