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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3088c5f8a5bc304f69e8502a3afd778246ba8e0c98b642412ff17357db746502' 
  AND token = 'Qu5PGzTIFugMF6n5VbSHzfEPQHR1Y9ef2fxXkH6HrhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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