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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1183d9271a7700bd60798ff27071d6b105a3e5a2cd1edf6443e8f3f2f6a94351' 
  AND token = 'Xjb8C1haaMW1chpSHOewcT4t+PNDzuUGHunaJvl8RbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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