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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a40e9ac140a435859441d35a075b186feb7c406a9c88c827ce3f653e30588ee' 
  AND token = 'AjIXMzsNhSJzpNYaQnjn4xxAEyc0PmfU5dAw89Te12U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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