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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43daeca806927413785d88b53699e661231c0d8763634d40c8cab58f35694e1' 
  AND token = 'Mas+U/NCFJ1t/8fbykBCYQDyQjy360itXgGc3Af83MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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