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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dc54412d5bbdd78d3233517ad33ae5fd4210c3f11d02c7b57560e768b0f77e' 
  AND token = 'rBbpwbIOj9vhGI5ExIzXorl0+37szpOOyZSWRL2P4tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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