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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559191243a4817398319da0bd50efcb0a6004a675840f94d82c712ad8abbaf02' 
  AND token = 'FKVm/Cwb/QkD2bF/lxeXVFzV6pr481+m1W14y2rUX90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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