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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d2c4c681dad50f69ddebd8fd291d8c9cd0d8ff7295f715cb06bd09427470f1' 
  AND token = 'BpATS3Guw63sWgSP5nfYPZ4/7sPEHYydt1p36aPpP+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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