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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d028a9e186b260a10794da961323396a0c9a9d2618c324ca9409583279d8d9' 
  AND token = 'dt8Htr4bUSc/Ol5izHOeGmqJizxQRaKY1C3PWL+X8EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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