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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bb27ba7894b8183018a8a6ce2d6773e0d55f302a62e8de8e79089d9ce83776' 
  AND token = 'tefWwkY7DQwFeNYmkrAhvBBeF4OqKhCltbE9bqlA43k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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