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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34e27477bc3e818280136feaac05204a10cc0109f86da8d923b75b05ffc58b0' 
  AND token = 'r4RoeZ//6I2Q2QBS7Dg9A8ITfvVM9eDz3ZRruRCqjWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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