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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f689a93e2eafb41f1ac6885a50f861f8bff1ad20cfaf481d6c3315ae7eeb4af9' 
  AND token = '33ZtpzI1qWZD6RyZxaIaP5sh5N1gS7iuLzjnOYGAOTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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