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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23cf3822cf08573e61706567daeb7be742c2b1af9c6872db37365c74b713c91' 
  AND token = '3LIWxag7NqWpG545MWwU/LuY2ogcOErr3Q3l5XrwsAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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