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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3a5da8097df41070fa22bc430f3e569dfcb5989e69afd8415c360d1ffa8ffa' 
  AND token = 'AROOm7B9tpqY1jNg6f44XMMyQu5LS7Zc86vWfLin7KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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