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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b5fc3c356f910e1c2d43fcbd5da8344e8f889bab7e5b783acf686446886f98' 
  AND token = 'J9mAU81mhI9wrvxAxcz2WmAK+jo51WWD9/5a8/6STiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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