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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c05e9c9b9055a1d2b0f004d50bd46ead0e41b35a087e8957d4dc942e118c26' 
  AND token = 'Yb/z/1TZNUedaB171W32SMtaeW4RM5VJmGvhyS2In1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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