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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473b3007f0cd58c6541ed3d2a84b820dcc1d7084deddcc1d9a467a4e249cbbc2' 
  AND token = 'hlDoiFzWwd3qsMNKVLJHzHMzjVPXtaJzCYpN/Vm8H1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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