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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f81c9ca566dba485645b5a4a514b2c69039640c55cc87dbd11ab0fa43854c2' 
  AND token = 'sGhcYb4L3pUdW2pLKB8yzuagQZxzmkc6MQGRz8tn+fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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